Malicious PDF — malware analysis report

Static analysis result for SHA-256 3341ff95e57cd60c…

MALICIOUS

PDF

64.8 KB Created: 2020-12-22 14:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 840d39a2f86333e44b3f83e01d233d38 SHA-1: b6447baccebbc5d81c991a2e23b30fb4b4437693 SHA-256: 3341ff95e57cd60c58a900e45ab9395ca7b31aeb83e0c29254fed8043770b635
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a 'PDF link farm'. The primary URL points to a site that appears to be part of this farm, suggesting a phishing or redirection attempt. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely used to distribute further malicious content or engage in ad fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafficel.ru/aws?utm_term=tratamiento+nutricional+para+anorexia+nerviosa+pdf
    • https://cdn-cms.f-static.net/uploads/4452152/normal_5fb4f55c3f4be.pdf
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/a2938ea02e9b.pdf
    • https://cdn-cms.f-static.net/uploads/4449605/normal_5fad14535e6fc.pdf
    • https://cdn-cms.f-static.net/uploads/4379471/normal_5fa1ed4f9744e.pdf
    • https://cdn-cms.f-static.net/uploads/4401972/normal_5faffcf2a48f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/babecfad-e627-45b0-a299-0cc215a974ef/ameristep_doghouse_blind_reviews.pdf
    • https://s3.amazonaws.com/pirofopafu/video_converter_pro_apk_akingi.pdf
    • https://uploads.strikinglycdn.com/files/5a6239da-5afe-46d2-bf86-d40199e14cc7/quints_by_surprise_divorce_2015.pdf
    • https://s3.amazonaws.com/jidagafinuxesu/62775407751.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0ab.bin
246079da9659f5ef2f95618cf97812b0a0b1ce77c3022e944284409c21fdc8da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AB 5376 bytes
font_01_sfnt_off0000d2e3.bin
653fc5aa6853b92dec13530de2e1888c98c2f7063e49318e695e2f66fc8e0dfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E3 10308 bytes

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